Geology topics
B.M. Blanchard
Publications and source records attributed to B.M. Blanchard.
Cannibalism and predation on black bears by grizzly bears in the Yellowstone ecosystem, 1975-1990
We documented one instance of an adult male grizzly bear preying upon a black bear and four instances where circumstantial evidence suggested that grizzly bears (two cubs-of-the-year, one yearling female that was injured, and one adult male) had been preyed upon by conspecifics. We also examined feces of grizzly bears for bear remains. Remains of bears tended to be more common in spring feces and did not differ in frequency between early and late years of the study. Our observations generally support existing hypotheses concerning cannibalism among bears.
Reactions of grizzly bears, Ursus arctos horribilis, to wildfire in Yellowstone National Park, Wyoming
No abstract available.
Relationships between whitebark pine cone production and fall grizzly bear movements
No abstract available.
Mortality patterns and population sinks for Yellowstone grizzly bears, 1973-1985
No abstract available.
Monitoring grizzly bear population trends
A simple different equation model was developed to provide additional perspective on observed mortality and trend data on Yellowstone grizzly bears ( Ursus arctos horribilis ). Records of mortalities of adult females from 1959 to 1985 were utilized, in conjunction with data on females with cubs. The overall downward trend of observed numbers of females with cubs generally agrees with the model calculations but does not adequately reflect mortality from 1970 to 1974. The model may be useful in developing a composite index of population trend.
Climate, carrying capacity, and the Yellowstone grizzly bear
No abstract available.